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Propylene polymer with improved processability in thermoforming

a technology of thermoforming and polypropylene, which is applied in the field of polypropylene polymer, can solve the problems of all efforts to broaden the thermoforming processing window of polypropylene, and achieve good mechanical properties

Inactive Publication Date: 2012-09-27
TOTAL RES & TECH FELUY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0128]The following examples illustrate the advantages of the present invention and also give exemplary processing conditions for the sheet production and the forming stages. It is deemed well within the skills of the persons skilled in the art of thermoforming to adapt these processing conditions to his / her specific equipment.

Problems solved by technology

So far, however, all efforts to broaden the processing window of polypropylene in thermoforming have been unsuccessful.

Method used

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  • Propylene polymer with improved processability in thermoforming
  • Propylene polymer with improved processability in thermoforming
  • Propylene polymer with improved processability in thermoforming

Examples

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examples

[0128]The following examples illustrate the advantages of the present invention and also give exemplary processing conditions for the sheet production and the forming stages. It is deemed well within the skills of the persons skilled in the art of thermoforming to adapt these processing conditions to his / her specific equipment.

[0129]Test Methods

[0130]The melt flow index (MFI) was measured according to ISO 1133, condition L, using a weight of 2.16 kg and a temperature of 230° C.

[0131]Flexural modulus was determined according to ISO 178:2001.

[0132]Notched izod impact strength was determined according to ISO 180 / A:2000 at 23° C.

[0133]Top load of the thermoformed cups was determined in accordance with ISO12048:1994.

[0134]Haze was measured according to ISO 14782:1999 on injection molded plaques having a thickness of 1 mm.

[0135]The total ethylene content (wt % C2) relative to the total weight of the propylene polymer is determined by NMR analysis of pellets according to the method describ...

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Abstract

The present invention concerns a propylene polymer comprising at least two propylene polymer fractions of different melt flow index and a minor amount of at least one comonomer, said propylene polymer being further characterized by specific ranges for melt flow index, xylene solubles content and recovery compliance. Said propylene polymer is particularly suited for thermoforming. The present invention further concerns a process for producing said propylene polymer as well as its use in thermoforming.

Description

FIELD OF THE INVENTION[0001]The present invention concerns a propylene polymer comprising at least two propylene polymer fractions of different melt flow index and a minor amount of at least one comonomer, said propylene polymer being further characterized by specific ranges for melt flow index, xylene solubles content and recovery compliance. Said propylene polymer is particularly suited for thermoforming. The present invention further concerns a process for producing said propylene polymer as well as its use in thermoforming.THE TECHNICAL PROBLEM AND THE PRIOR ART[0002]In thermoforming, a soft polymer sheet is draped over or into a form or mold. In its basic form a thermoforming process comprises the steps of[0003](i) warming the sheet to a temperature at which it is soft,[0004](ii) draping the soft sheet over or into a mold, thus obtaining a formed sheet,[0005](iii) cooling the formed sheet to a temperature at which it can maintain its shape, and[0006](iv) removing the formed she...

Claims

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Application Information

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IPC IPC(8): C08F110/06B29C51/42C08F4/64
CPCC08F10/06C08F110/06C08F210/06C08F2410/04C08F2/001C08F4/651C08F210/16C08F2500/05C08F2500/12C08F2500/15C08F2500/21C08F297/083C08L23/14C08L23/16C08L2205/025C08F2/00C08F4/64C08J5/00B29C51/002B29C51/02B29K2023/14
Inventor FORGUE, THOMASGROMADA, JEROMESTANDAERT, ALAINDE LUCA, RITA
Owner TOTAL RES & TECH FELUY